package com.nowcoder.community.controller;

import com.nowcoder.community.annotation.LoginRequired;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

@Controller
@RequestMapping("/user")
public class UserController implements CommunityConstant {
    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    @Value("${community.path.upload}")
    private String uploadPath;
    @Value("${community.path.domain}")
    private String domain;
    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;
    @Autowired
    private HostHolder hostHolder;

    @LoginRequired
    @RequestMapping(path = "/setting", method = RequestMethod.GET)
    public String getSettingPage(){
        return "/site/setting";
    }

    @LoginRequired
    @RequestMapping(path = "/upload",method = RequestMethod.POST)//上传时表单的提交方式为POST
    public String uploadHeader(MultipartFile headerImage, Model model){
        if(headerImage==null){
            model.addAttribute("error", "您还没有选择图片");
            return "/site/setting";
        }

        String fileName = headerImage.getOriginalFilename();
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        if(StringUtils.isBlank(suffix)){
            model.addAttribute("error", "文件格式不正确");
            return "/site/setting";
        }

        //生成随机文件名
        fileName = CommunityUtil.generateUUID()+suffix;
        //确定文件存放的路径
        File dest = new File(uploadPath+"/"+fileName);
        try {
            //存文件
            headerImage.transferTo(dest);
        } catch (IOException e) {
            logger.error("上传文件失败 "+e.getMessage());
            throw new RuntimeException("上传文件失败，服务器发生异常",e);
        }

        //更新当前用户的头像的路径（web访问路径）
        //http://local:8080/community/user/header/xxx.png
        User user = hostHolder.getUser();
        String headerUrl = domain+contextPath+"/user/header/"+fileName;
        userService.updateHeader(user.getId(), headerUrl);

        return "redirect:/index";

    }

    //获取头像
    @RequestMapping(path = "/header/{fileName}",method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName") String fileName, HttpServletResponse response){
        //服务器存放的路径
        fileName=uploadPath+"/"+fileName;
        //输出图片
        //文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
        //响应图片
        response.setContentType("image/"+suffix);
        try(
                OutputStream os =  response.getOutputStream();
                FileInputStream fis = new FileInputStream(fileName);
                ) {
            byte[] buffer = new byte[1024];
            int b=0;
            while(( b=fis.read(buffer) ) != -1){
                os.write(buffer,0,b);
            }
        } catch (IOException e) {
            logger.error("读取头像失败"+e.getMessage());
        }
    }

}
